Algae blooms have killed hundreds of thousands of fish in the last two weeks, but what exactly are they and how do we get them under control?

Children in the Willows forest nature program in the Humber Valley in west Toronto are drawn to water and sticks, simple materials for exploring and investigating. Here the children explore water accumulated from spring rains.
(Louise Zimanyi)
December 13, 2018

Hurricanes in the southern US have caused widespread damage inland in recent decades, mainly through river flooding. But evacuations and stormproofing focus almost entirely on keeping people safe on the coasts.